The Second International Socialist Women's Conference was held on August 26–27, 1910 in Copenhagen, in conjunction with the 1910 Socialist Copenhagen World Congress. One hundred delegates attended from seventeen countries. Among the groups represented were the Social Democratic women of Germany, the Women's Labour League, Federation of Socialist Women's Clubs from the Netherlands and many others. Though conference addressed a number of issues including social legislation, education, public health and the Czars attempt to erode the sovereignty of Finland, its most animated discussion were on women's suffrage. A debate evolved between the English delegates who favored working with "bourgeois" feminists in order to secure piecemeal expansion of the franchise and the Germans and the "lefts" who felt it was best to merge the proletarian woman's movement into a larger working class struggle to gain universal suffrage. The latter view predominated.[5] This conference is also remembered for endorsing the idea of an international day of concerted action to protest for female suffrage, on the model of the annual May Day celebrations.[6] This was eventually institutionalized as International Women's Day.

The Third International Socialist Women's Conference was scheduled to be held in Vienna in August 1914, concurrently with the Vienna International Socialist Congress. After the outbreak of the war both events were cancelled. In November 1914 the editors of the Bolshevik women's paper Rabotnitsa contacted the International Secretariat at Stuttgart, suggesting an unofficial conference of left socialist women. Further efforts by the women of the socialist movement led to the convening of the Third International Socialist Women's Conference at Berne March 26–28, 1915.[7]

The debates at the Conference revealed some of the rifts that were appearing even among anti-war socialists. While resolutions on the high costs of living and against the persecution of Rosa Luxembourg and the Social Democratic Duma members were passed unanimously, the resolutions on the war and nationalism were more controversial. The Bolsheviks introduced a draft resolution that the Bolsheviks put forward advocated turning the imperialist war into a civil war, carrying out "revolutionary activity among the masses", a complete break and denunciation of the pro-war socialists and a Third International. This was defeated by a vote of 21 to 6. Klara Zetkins draft resolution carried by the same number. The debate on combating chauvinism and nationalism was equally acrimonious. The Bolsheviks suggested joint revolutionary action between the workers of all countries, while the English put forward a resolution endorsing the International Women's Congress at the Hague. the latter was carried by a vote of all the delegates except the Bolsheviks and the Pole.[9]

The resolution and manifesto that the conference did issue reiterated the hardships that working women had to endure because of the war, the "lie" that the war was one of national defense, blamed the war on capitalists and the armaments race and suggested that socialist women of the various countries unite for international peace action, but neglected to mention the official socialist parties support of the war, or offer any concrete methods to oppose it.[10]

An unofficial and informal conference was held in Stockholm September 14–15, 1917 by the female delegates from the Third Zimmerwald Conference. The Conference first reviewed the activity of the Berne conference and noted that the subsequent Zimmerwald manifestos and resolutions "emphasized and underscored the principle lines" first drawn up by the socialist women. The meeting also approved a resolutions of the All-German Women's Committee of the Independent Social Democratic Party of Germany and the demands of unnamed French female socialist and labor leaders on the effects of the war on women and children.[11]

Messages of solidarity were received for Klara Zetkin and the suppression of Gleicheit condemned. The conference also noted that funds were being collected in various countries to start a new Gleicheit, particularly from the Italians. Written reports and letters were received from France, Britain, the United States and Finland, and oral reports were delivered on the situation of Socialist women in Germany, Austria, Bulgaria, Finland, Russia, Romania, Sweden and Switzerland. The conference ended with a renewed pledge for the women of the socialist movement to draw closer on the basis of the Berne and Zimmerwald resolutions.[12]

No written list of attendees was published, but the following female delegates were known to have attended the Third Zimmerwald Conference: Therese Schlesinger, Rosa Bloch, Kathe Dunker, Elisabeth Luzzatto, Angelica Balabanoff[13]